JEE Advanced · 2018 · 20 May 2018 · Paper 2 · p-Block Elements

A bridging oxo group is an oxygen atom bonded to two central atoms. Examining the structures: ${\mathrm{N}}_2{\mathrm{O}}_3$ has one bridging O; ${\mathrm{N}}_2{\mathrm{O}}_5$ has one bridging O; ${\mathrm{P}}_4{\mathrm{O}}_6$ has six bridging O atoms; ${\mathrm{P}}_4{\mathrm{O}}_7$ has bridging O atoms; ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_5$ (pyrophosphorous acid) has one P-O-P bridge; ${\mathrm{H}}_5{\mathrm{P}}_3{\mathrm{O}}_{10}$ has P-O-P bridges; ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ (thiosulfuric acid) has no bridging oxo (S-S bond); ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_5$ (disulfuric acid) has one S-O-S bridge. Total: 6 compounds have at least one bridging oxo group.